Method, user equipment and base station for transmitting uplink control information

ABSTRACT

The disclosure discloses a method for transmitting uplink control information. The method includes: receiving, by a user equipment, a carrier activation command or a carrier deactivation command in a downlink subframe n; updating a first downlink activated carrier set according to the received carrier activation command or the carrier deactivation command into a second downlink activated carrier set; taking the second downlink activated carrier set as a current downlink activated carrier set corresponding to a first uplink subframe which belongs to a subframe set of an uplink subframe n+k and uplink subframe(s) after the uplink subframe n+k; sorting X piece(s) of Uplink Control Information (UCI) corresponding to X downlink carrier(s) according to a sorting rule, and transmitting the sorted X pieces of UCI to a base station in the first uplink subframe.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 14/533,938, now U.S. Pat. No. 9,807,741, filed on Nov. 5, 2014, which is a continuation of U.S. patent application Ser. No. 13/914,432, filed on Jun. 10, 2013, now U.S. Pat. No. 8,913,580 and continuation of patent application Ser. No. 13/633,010, filed on Oct. 1, 2012, now U.S. Pat. No. 8,797,967, which is a continuation of International Application No. PCT/CN2011/072469, filed on Apr. 6, 2011. The International Application claims priority to Chinese Patent Application No. 201010146531.3, filed on Apr. 7, 2010. All of the afore-mentioned patent applications are hereby incorporated by reference in their entireties.

FIELD OF THE INVENTION

The present invention relates to the field of communications technologies, and in particular, to a method, a system, a user equipment and a base station for transmitting uplink control information.

BACKGROUND OF THE INVENTION

The LTE-A (Long Term Evolution-Advanced) is a further evolved and enhanced system based on a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) system. In the LTE-A system, a CA (Carrier Aggregation) technology is introduced, which is also referred to as a frequency spectrum aggregation technology or bandwidth expansion technology. In a carrier aggregation scenario, frequency spectrums of two or more CCs (Component Carriers) are aggregated to obtain larger transmission bandwidth.

When performing decoding, an eNB (Evolved NodeB) needs to learn the total number of bits of the original information of UCI (Uplink Control Information) joint channel coding adopted by a UE, that is, to ensure that the eNB and UE have consistent understanding on the total number of bits of the original information of UCI joint coding of multiple downlink carriers, so as to perform correct decoding. However, the existing method for transmitting UCI causes that the eNB decodes the jointly coded UCI incorrectly.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method, a user equipment and a base station for transmitting uplink control information, so as to avoid a problem that the eNB decodes the jointly coded UCI incorrectly.

In an aspect, a method for transmitting uplink control information in an embodiment of the present invention is provided, including:

receiving, by a user equipment (UE), a carrier activation command or a carrier deactivation command in a downlink subframe n; updating, by the UE, a first downlink activated carrier set according to the received carrier activation command or the carrier deactivation command into a second downlink activated carrier set; taking, by the UE, the second downlink activated carrier set as a current downlink activated carrier set corresponding to a first uplink subframe; wherein the first uplink subframe belongs to a subframe set of an uplink subframe n+k and uplink subframe(s) after the uplink subframe n+k; and wherein n or k is a positive integer, and k is greater than or equal to 5; sorting, by the UE, X piece(s) of Uplink Control Information (UCI) corresponding to X downlink carrier(s) according to a sorting rule, wherein X is a positive integer, and the X downlink carrier(s) belong to the current downlink activated carrier set; and transmitting, by the UE, the sorted X pieces of UCI to a base station in the first uplink subframe.

In an aspect, a method for transmitting uplink control information in another embodiment of the present invention is provided, including:

sending, by a base station, a carrier activation command or a carrier deactivation command in a downlink subframe n; receiving, by the base station, sorted X piece(s) of Uplink Control Information (UCI) corresponding to X downlink carrier(s) in a first uplink subframe from a user equipment (UE); and determining, by the base station, a piece of UCI corresponding to a downlink carrier of the X downlink carrier(s) according to the sorted X piece(s) of UCI; wherein the sorted X piece(s) of UCI are sorted by the UE according to a sorting rule; wherein X is a positive integer, and the X downlink carrier(s) belong to a current downlink activated carrier set; wherein a first downlink activated carrier set is updated by the UE into a second downlink activated carrier set according to the carrier activation command or the carrier deactivation command and the second downlink activated carrier is taken as the current downlink activation carrier set corresponding to the first uplink subframe; and wherein the first uplink subframe belongs to a subframe set of an uplink subframe n+k and uplink subframe(s) after the uplink subframe n+k, and n or k is a positive integer, and k is greater than or equal to 5.

In an aspect, a user equipment in an embodiment of the present invention is provided, including:

a receiver, configured to receive a carrier activation command or a carrier deactivation command in a downlink subframe n; a processor, configured to update a first downlink activated carrier set according to the received carrier activation command or the carrier deactivation command into a second downlink activated carrier set; take the second downlink activated carrier set as a current downlink activated carrier set corresponding to a first uplink subframe; and sort X piece(s) of Uplink Control Information (UCI) corresponding to X downlink carrier(s) according to a sorting rule, wherein the first uplink subframe belongs to a subframe set of an uplink subframe n+k and uplink subframe(s) after the uplink subframe n+k, n or k is a positive integer, k is greater than or equal to 5, X is a positive integer, and the X downlink carrier(s) belong to the current downlink activated carrier set; a transmitter, configured to transmit the sorted X pieces of UCI to a base station in the first uplink subframe.

In an aspect, a base station in an embodiment of the present invention is provided, including:

a transmitter, configured to send a carrier activation command or a carrier deactivation command in a downlink subframe n; a receiver, configured to receive sorted X piece(s) of Uplink Control Information (UCI) corresponding to X downlink carrier(s) in a first uplink subframe from a user equipment (UE); and a processor, configured to determine a piece of UCI corresponding to a downlink carrier of the X downlink carrier(s) according to the sorted X piece(s) of UCI; wherein the sorted X piece(s) of UCI are sorted by the UE according to a sorting rule; wherein X is a positive integer, and the X downlink carrier(s) belong to a current downlink activated carrier set; wherein a first downlink activated carrier set is updated by the UE into a second downlink activated carrier set according to the carrier activation command or the carrier deactivation command and the second downlink activated carrier is taken as the current downlink activation carrier set corresponding to the first uplink subframe; and wherein the first uplink subframe belongs to a subframe set of an uplink subframe n+k and uplink subframe(s) after the uplink subframe n+k, and n or k is a positive integer, and k is greater than or equal to 5.

When the UE reports UCI, by delaying effective time of the carrier activation command/deactivation command, the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of UCI joint coding of multiple downlink carriers may be solved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of a method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 2 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 3 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 4 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 5 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 6 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 7 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 8 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 9 is a flow chart of another method for transmitting uplink control information according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of another user equipment according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of another base station according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a system for transmitting uplink control information according to an embodiment of the present invention; and

FIG. 15 is a schematic structural diagram of another system for transmitting uplink control information according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

For better understanding of the objectives, technical solutions, and advantages of the present invention, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

In a carrier aggregation scenario, an eNB configures or reconfigures a schedulable carrier set, for example, a UE DL CC set (User Equipment Downlink Component Carrier Set), for an LTE-A user equipment through semi-static RRC (Radio Resource Control) signaling. Meanwhile, in order to save power, a carrier activation (namely, turning on)/deactivation (namely, turning off) mechanism is introduced based on the semi-statically configured UE DL CC set. Except a downlink main carrier, other component carriers may be activated or deactivated according to service requirements. If a current service rate of a UE increases, the eNB may activate one or several carriers that are not activated in the UE DL CC set to perform data transmission. If the current service rate of the UE decreases, the eNB may deactivate one or several carriers that are already activated except the main downlink carrier in the UE DL CC set. Activation/deactivation is completed through MAC (Medium Access Control) layer signaling. Each piece of MAC layer carrier activation command/deactivation command may activate or deactivate one or more carriers except the main carrier in the UE DL CC set. After delivering the MAC layer signaling, the eNB may learn whether the activation command/deactivation command is transmitted successfully through ACK/NACK feedback. For the deactivation command, an implicit deactivation mechanism is further introduced for optimization, that is, an implicit deactivation timer is introduced. The timer is started at a certain reception, and if the timer times out, a corresponding carrier is deactivated.

Meanwhile, in an LTE-A system, in order to support technologies, such as dynamic scheduling, downlink MIMO (Multiple Input Multiple Output) transmission and hybrid automatic retransmission, the UE needs to transmit UCI of a downlink carrier to the eNB through a PUCCH (Physical Uplink Control Channel) and/or PUSCH (Physical Uplink Share Channel), and the UE needs to transmit UCI of multiple downlink carriers to the eNB in the carrier aggregation scenario. In the LTE-A system, UCI that the UE needs to transmit usually includes CSI (Channel State Information) and HARQ (Hybrid Automatic Repeat request, hybrid automatic repeat request) acknowledgment information (ACK (Acknowledgment)/NACK (Negative Acknowledgement)). CSI usually includes implicit channel state information, such as CQI (Channel Quality Information, channel quality information), RI (Rank Indication), PMI (Precoding Matrix Indicator), and direct channel state information, such as a channel matrix or a channel covariance matrix.

Currently, in the carrier aggregation scenario, when ACK/NACK or CSI of multiple downlink carriers is transmitted on one PUCCH or one PUSCH, usually, the UE needs to perform joint channel coding on the ACK/NACK or CSI of the multiple downlink carriers. The eNB performs decoding according to the channel coding method adopted by the UE.

When performing decoding, the eNB needs to know the total number of original information bits of UCI (Uplink Control Information) joint channel coding adopted by a UE, that is, to ensure that the eNB and the UE have consistent understanding on the total number of original information bits of UCI joint coding of multiple downlink carriers, so as to perform correct decoding. However, the existing method for transmitting UCI causes that the eNB decodes the jointly coded UCI incorrectly.

Referring to FIG. 1, an embodiment of the present invention provides a method for transmitting uplink control information, which includes the following.

101: A user equipment sorts uplink control information UCI of each downlink carrier in X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, the X downlink carrier(s) belong to a downlink component carrier set of the user equipment, the downlink component carrier set of the user equipment at least includes two downlink component carriers, and at least one downlink carrier in the X downlink carrier(s) belongs to a downlink activated carrier set of the user equipment.

102: The user equipment calculates, according to a first carrier set, the number of modulation symbols occupied by UCI of the user equipment, where the first carrier set is one of the following sets: the downlink component carrier set of the user equipment, a maximum downlink carrier set supportable by the user equipment, and a smaller one of the downlink component carrier set of the user equipment and the maximum downlink carrier set supportable by the user equipment.

103: The user equipment calculates the number of bits after channel coding of UCI of the user equipment according to the number of modulation symbols occupied by UCI of the user equipment.

104: The user equipment performs channel coding for the sorted UCI of the X downlink carrier(s) according to the number of bits after channel coding of UCI of the user equipment, maps the channel coded UCI of the X downlink carrier(s) to a physical channel and transmits the mapped UCI of the X downlink carrier(s) to a base station.

Further, when UCI of the user equipment is hybrid automatic repeat request HARQ acknowledgment information, the X downlink carrier(s) are all downlink carriers in the downlink activated carrier set.

Further, when UCI of the user equipment is channel state information CSI, the X downlink carrier(s) are determined according to CSI configuration configured by higher layers and whether aperiodic CSI is to be reported, and the X downlink carrier(s) belong to the downlink activated carrier set of the user equipment.

Further, the preset sorting rule includes one of the following rules:

-   -   performing sorting according to an increasing order of         attributes of downlink carriers corresponding to UCI of the         downlink carriers;     -   performing sorting according to a decreasing order of attributes         of downlink carriers corresponding to UCI of the downlink         carriers;     -   performing sorting according to an activation sequence of the         downlink carriers.

Further, when UCI of each downlink carrier in the X downlink carrier(s) is sorted according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to the increasing or decreasing order of the attributes of the downlink carriers.

Further, an attribute of a downlink carrier is a carrier index or a carrier frequency.

Further, when UCI of the user equipment is the channel state information CSI, the calculating, by the user equipment according to the first carrier set, the number of modulation symbols occupied by UCI of the user equipment is specifically:

-   -   calculating, by the user equipment, the number of modulation         symbols occupied by CSI of the user equipment, according to the         first carrier set, CSI configuration configured by higher layers         and whether aperiodic CSI is to be reported.

In the method for transmitting uplink control information according to the embodiment of the present invention, the user equipment performs channel coding on UCI of the X downlink carrier(s) according to the number of bits after channel coding of UCI of the user equipment, and transmits UCI of the X downlink carrier(s) to the base station, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the user equipment and base station on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the user equipment sorts UCI of multiple downlink carriers according to the preset sorting rule, so that the base station may determine UCI corresponding to each downlink carrier.

Referring to FIG. 2, an embodiment of the present invention provides another method for transmitting uplink control information, which includes the following.

201: A user equipment sorts uplink control information UCI of each downlink carrier in X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, and the X downlink carrier(s) belong to a downlink activated carrier set of the user equipment.

202: The user equipment performs channel coding for the sorted UCI of the X downlink carrier(s) according to the number of bits after channel coding of UCI of the user equipment, maps the channel coded UCI of the X downlink carrier(s) to a physical channel and transmits the mapped UCI of the X downlink carrier(s) to a base station.

Further, when UCI of the user equipment is hybrid automatic repeat request HARQ acknowledgment information, the X downlink carrier(s) are all downlink carriers in the downlink activated carrier set.

Further, the preset sorting rule is: performing sorting according to an activation sequence of the downlink carriers.

Further, when UCI of the X downlink carrier(s) and a scheduling request SR are reported on the same subframe, the preset sorting rule is: performing sorting according to a sequence of arranging the SR first, and then arranging UCI of each downlink carrier in the X downlink carrier(s) after the SR based on the activation sequence of the downlink carriers.

Further, when UCI of each downlink carrier in the X downlink carrier(s) is sorted according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to attributes of the downlink carriers.

Further, an attribute of a downlink carrier is a carrier index or a carrier frequency.

In the method for transmitting uplink control information according to the embodiment of the present invention, the user equipment performs channel coding on UCI of the X downlink carrier(s) according to the number of bits after channel coding of UCI of the user equipment, and transmits UCI of the X downlink carrier(s) to the base station, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the user equipment and base station on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the user equipment sorts UCI of multiple downlink carriers according to the preset sorting rule, so that the base station may determine UCI corresponding to each downlink carrier.

Referring to FIG. 3, an embodiment of the present invention provides another method for transmitting uplink control information, which includes the following.

301: Calculate the number of modulation symbols occupied by uplink control information UCI according to a first carrier set, where the first carrier set is one of the following sets: a downlink component carrier set of a user equipment, a maximum downlink carrier set supportable by the user equipment, and a smaller one of the downlink component carrier set of the user equipment and the maximum downlink carrier set supportable by the user equipment, and the downlink component carrier set of the user equipment at least includes two downlink component carriers.

302: According to the number of modulation symbols occupied by UCI, extract UCI transmitted by the user equipment, and calculate the number of bits after channel coding corresponding to the transmitted UCI.

303: Perform channel decoding on the transmitted UCI according to the number of bits after channel coding corresponding to the transmitted UCI, and determine UCI corresponding to each downlink carrier according to a preset sorting rule.

Further, when UCI of the user equipment is channel state information CSI, the calculating the number of modulation symbols occupied by UCI according to the first carrier set is specifically:

-   -   calculating the number of modulation symbols occupied by CSI,         according to the first carrier set, CSI configuration configured         by higher layers and whether aperiodic CSI is to be reported.

Further, the preset sorting rule includes one of the following rules: performing sorting according to an increasing order of attributes of downlink carriers corresponding to UCI of the downlink carriers;

-   -   performing sorting according to a decreasing order of attributes         of downlink carriers corresponding to UCI of the downlink         carriers;     -   performing sorting according to an activation sequence of the         downlink carriers.

Further, when the preset sorting rule is performing sorting according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to the increasing order or decreasing order of the attributes of the downlink carriers.

Further, an attribute of a downlink carrier is a carrier index or a carrier frequency.

In the method for transmitting uplink control information according to the embodiment of the present invention, a base station obtains, according to the first carrier set, the number of modulation symbols occupied by UCI, extracts, according to the number of modulation symbols occupied by UCI, UCI transmitted by the user equipment, and obtains the number of bits after channel coding corresponding to the transmitted UCI, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the base station and the user equipment on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the base station may determine UCI corresponding to each downlink carrier according to the preset sorting rule.

An embodiment of the present invention provides another method for transmitting uplink control information, which includes:

-   -   according to the preset number of bits after channel coding         corresponding to uplink control information UCI, performing         detection on UCI transmitted by a user equipment, and according         to a preset sorting rule, determining UCI corresponding to each         downlink carrier.

Further, the preset sorting rule is performing sorting according to an activation sequence of downlink carriers; if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to an increasing or a decreasing order of attributes of the downlink carriers.

Further, when UCI of the user equipment and a scheduling request SR are reported on the same subframe, the determining UCI corresponding to each downlink carrier according to the preset sorting rule is specifically:

-   -   determining the SR and UCI corresponding to each downlink         carrier according to a sequence of arranging the SR first, and         then arranging UCI of the X downlink carrier(s) after the SR         based on an activation sequence of the downlink carriers, where         X is a positive integer.

In the method for transmitting uplink control information according to the embodiment of the present invention, a base station performs detection on UCI transmitted by the user equipment according to the preset number of bits after channel coding corresponding to the uplink control information UCI, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the base station and the user equipment on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the base station may determine UCI corresponding to each downlink carrier according to the preset sorting rule.

For better understanding of the embodiment of the present invention, the method of the embodiment of the present invention being applied in a carrier aggregation scenario, where ACK/NACK of one or more downlink carriers is transmitted on a PUSCH, is taken as an example for further illustration.

Referring to FIG. 4, an embodiment of the present invention provides another method for transmitting uplink control information, which includes the following.

401: A UE sorts ACK/NACK of each downlink carrier in X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, the X downlink carrier(s) belong to a downlink component carrier set of the UE, the downlink component carrier set of the user equipment at least includes two downlink component carriers, at least one downlink carrier in the X downlink carrier(s) belongs to a downlink activated carrier set of the user equipment, and the X downlink carrier(s) herein are all downlink carriers of a downlink carrier set of the UE.

The preset sorting rule may be performing sorting according to an activation sequence of the downlink carriers. Moreover, when multiple downlink carriers are activated at the same time, ACK/NACK of the multiple downlink carriers activated at the same time may be sorted according to attributes of the downlink carriers corresponding to ACK/NACK of the downlink carriers. An attribute of a downlink carrier may be a carrier index (Carrier Index/Carrier Identity) or a carrier frequency of the downlink carrier. Specifically, the ACK/NACK of the multiple downlink carriers activated at the same time may be sorted according to an increasing or a decreasing order of attributes of the downlink carriers.

Specifically, for each downlink carrier in the X downlink carriers, if the ACK/NACK is required to be fed back, and the ACK/NACK supports spatial bundling (spatial bundling), each downlink carrier corresponds to 1-bit ACK or NACK; if the ACK/NACK is required to be fed back, and the ACK/NACK does not support spatial bundling, each downlink carrier corresponds to 2-bit ACK or NACK. If the ACK/NACK is not required to be fed back, and the ACK/NACK supports spatial bundling, each downlink carrier corresponds to 1-bit NACK; if the ACK/NACK is not required to be fed back, and the ACK/NACK does not support spatial bundling, each downlink carrier corresponds to 2-bit NACK. The requiring the ACK/NACK to be fed back refers to that information of requiring the ACK/NACK to be fed back, such as data or PDCCH (Physical Downlink Control Channel, physical downlink control channel) signaling that indicates release of downlink SPS (Semi-Persistent Scheduling, semi-persistent scheduling) resources, is detected on the carrier.

The UE determines original information of the ACK/NACK of each downlink carrier in the X downlink carrier(s) according to the foregoing method, so that the total number of original information bits O^(ACK) in the X downlink carrier(s) is: O^(ACK)=X or O^(AcK)=2X. X corresponds to a scenario where the ACK/NACK supports spatial bundling, and 2X corresponds to a scenario where the ACK/NACK does not support spatial bundling.

402: The UE calculates the number of modulation symbols (coded symbols or modulation symbols) occupied by ACK/NACK of the UE, according to a first carrier set (CC set).

The first carrier set may be a downlink component carrier set of the user equipment (User Equipment Downlink Component Carrier Set), a maximum downlink carrier set supportable by the UE, or a smaller one of the downlink component carrier set of the user equipment and the maximum downlink carrier set supportable by the UE. Specifically, the number of modulation symbols occupied by the ACK/NACK of the user equipment is calculated according to the first carrier set and by utilizing Formula (1).

$\begin{matrix} {Q^{\prime} = {\min\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH}\text{-}{initial}} \cdot N_{symb}^{{PUSCH}\text{-}{initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}} & (1) \end{matrix}$

Q′ indicates the number of modulation symbols occupied by the ACK/NACK of the user equipment. O indicates the total number of information bits of all ACK/NACK corresponding to the first carrier set, where when the ACK/NACK of each downlink carrier supports spatial bundling, O=M, and when the ACK/NACK of each downlink carrier does not support spatial bundling, O=2M. M indicates the number of carriers included in the first carrier set. N_(layer) indicates the total number of layers corresponding to code words to which the ACK/NACK is mapped. M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of the PUSCH during initial transmission of the same transmission block. M_(sc) ^(PUSCH) indicates the transmission bandwidth of a PUSCH corresponding to a current subframe. N_(symb) ^(PUSCH-initial) indicates the number of SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols occupied by the same transmission block during initial transmission. β_(offset) ^(PUSCH) indicates the offset of the ACK/NACK relative to the data MSC (Modulation and Coding Scheme,). β_(offset) ^(PUSCH)=β_(offset) ^(HARQ-ACK)m where a value of β_(offset) ^(HARQ-ACK) is notified by upper-layer RRC (Radio Resource Control) signaling. C indicates the number of code blocks. K_(r) is a sum of the number of information bits of an r th code block and the number of CRC (Cyclical Redundancy Check) check bits.

403: The UE calculates the number of bits after channel coding of the ACK/NACK of the UE according to the number of modulation symbols occupied by the ACK/NACK of the UE.

Specifically, the number of bits after channel coding of the ACK/NACK of the UE is calculated according to the number of modulation symbols Q′ occupied by the ACK/NACK of the UE obtained in step 402 and by utilizing Formula (2). Q=Q _(m) ·Q′  (2)

where Q′ indicates the number of modulation symbols occupied by the ACK/NACK of the UE; Q indicates the number of bits after channel coding of the ACK/NACK of the UE; and Q_(m) indicates a modulation order.

404: The UE performs channel coding for the sorted ACK/NACK of the X downlink carrier(s) according to the number of bits after channel coding of the ACK/NACK of the UE, multiplexes the channel coded sorted ACK/NACK of the X downlink carrier(s) on a PUSCH with data, and transmits the multiplexed ACK/NACK to an eNB.

For example, if the original information of the sorted ACK/NACK of the X downlink carrier(s) obtained in step 401 has 3 bits, and the number of bits after channel coding of the ACK/NACK of the UE obtained in step 403 is 20 bits, then in this step, when channel coding is performed on the sorted ACK/NACK of the X downlink carriers, the 3-bit ACK/NACK should be coded to be 20-bit. In addition, exemplarily, RM (Reed-Muller) coding is adopted in this embodiment of the present invention, and in actual applications, any other feasible channel coding manner may be adopted according to specific conditions, which is not specifically defined.

405: The eNB calculates the number of modulation symbols occupied by the ACK/NACK, according to the first carrier set.

The first carrier set in this step is consistent with the first carrier set in step 402. If the first carrier set in step 402 is a downlink component carrier set of a user equipment, the first carrier set in this step is also the downlink component carrier set of the user equipment. The method for the eNB to calculate the number of modulation symbols occupied by the ACK/NACK according to the first carrier set is the same as that in step 402, which is not detailed herein again.

406: According to the number of modulation symbols occupied by the ACK/NACK, the eNB extracts ACK/NACK transmitted by the UE, and calculates the number of bits after channel coding corresponding to the ACK/NACK transmitted by the UE.

Because the eNB adopts the same manner as that of the UE to obtain the number of bits after channel coding corresponding to the ACK/NACK transmitted by the UE, because the eNB adopts the same manner as that of the UE to obtain the number of HARQ-ACK bits after channel coding, the number of HARQ-ACK bits after channel coding obtained by eNB is the same as the number of HARQ-ACK bits after channel coding obtained by UE.

407: The eNB performs channel decoding on the transmitted ACK/NACK according to the number of bits after channel coding corresponding to the ACK/NACK transmitted by the UE, and determines ACK/NACK corresponding to each downlink carrier according to a preset sorting rule.

Specifically, the channel decoding may be performed on the transmitted ACK/NACK by adopting a decoding method corresponding to the channel coding adopted in step 404; alternatively, the decoding may be performed by adopting any other feasible manner, which is not specifically defined. Moreover, the preset sorting rule in this step is consistent with the preset sorting rule in step 401. If the preset sorting rule in step 401 is sorting the ACK/NACK of multiple downlink carriers according to the activation sequence of the downlink carriers, the preset sorting rule in this step is also determining ACK/NACK corresponding to each downlink carrier according to the activation sequence of the downlink carriers.

It should be noted that, in this embodiment, when the eNB needs to deactivate downlink carriers, the eNB deactivates a downlink carrier included in a downlink activated carrier set according to a sequence that a carrier activated later is deactivated earlier (for example, when the ACK/NACK of the X downlink carrier(s) is sorted according to a sequence of arranging a downlink carrier activated earlier in the front, and arranging a downlink carrier activated later in the back, the eNB starts deactivation from the last downlink carrier in the downlink activated carrier set). Then, the UE repeats steps 401 to 404 to transmit the ACK/NACK of the X downlink carrier(s) according to the updated downlink activated carrier set.

It should be noted that, when ACK/NACK of the X downlink carrier(s) is sorted according to the sequence of arranging the downlink carrier activated earlier in the front, and arranging the downlink carrier activated later in the back, the ACK/NACK of a latest activated downlink carrier is arranged in the last place. The latest activated downlink carrier during a fuzzy period is usually NACK, and according to the characteristic of RM coding, the NACK arranged in the last place does not contribute to the coded bits of ACK/NACK. Therefore, even if the eNB performs decoding assuming that the number of HARQ-ACK bits transmitted by the UE is more or less than the number of HARQ-ACK bits that actually needs to be transmitted by the UE, correctness of the ACK/NACK that actually needs to be transmitted can still be ensured. For example, the downlink activated carrier set has three downlink carriers, where the last downlink carrier is a latest activated downlink carrier, and each downlink carrier supports ACK/NACK spatial bundling. Then, the total number of bits of the ACK/NACK jointly coded according to RM coding is 3. It is assumed that the first two downlink carriers both need to transmit ACK, and the last downlink carrier transmits NACK because it is just activated and has no scheduling data. Then, three bits transmitted on the PUSCH are 110, and according to the characteristic of RM coding, the bits of 110 after coding are consistent with the bits of 11 after coding. Therefore, even if the eNB does not learn that the UE has successfully detected an activation command of a downlink carrier 3 and has updated the total number of bits of the jointly coded ACK/NACK, and still decodes the transmitted ACK/NACK according to 2 bits, it is still ensured that the first 2 bits are decoded correctly.

In the method for transmitting uplink control information according to the embodiment of the present invention, the UE performs channel coding on the ACK/NACK of the X downlink carrier(s) according to the obtained number of bits after channel coding of the ACK/NACK of the UE, and transmits the ACK/NACK of the X downlink carrier(s) to the eNB, thereby solving the problem that the eNB decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of ACK/NACK joint coding of multiple downlink carriers. Moreover, the UE sorts the ACK/NACK of the multiple downlink carriers according to the preset sorting rule, so that the eNB may determine ACK/NACK corresponding to each downlink carrier. The UE sorts the ACK/NACK of each carrier according to an activation sequence of the downlink carriers, and the eNB deactivates a downlink carrier included in the downlink activated carrier set according to a sequence that the carrier activated later is deactivated earlier, so as to ensure that even if the eNB and the UE have inconsistent understanding on the total number of information bits of the jointly coded ACK/NACK, the ACK/NACK that truly needs to be transmitted is decoded correctly, thereby solving the problem that the eNB decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of the ACK/NACK joint coding of multiple downlink carriers. By use of the characteristic of the RM coding, the UE sorts the ACK/NACK of the X downlink carrier(s) according to a sequence of arranging the downlink carrier activated earlier in the front and arranging the downlink carrier activated later in the back, and always starts carrier deactivation from the last one in the activated carrier set, so as to ensure that even if the eNB and UE have inconsistent understanding on the total number of information bits of the jointly coded ACK/NACK, the ACK/NACK that truly needs to be transmitted is decoded correctly, thereby solving the problem that the base station decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of ACK/NACK joint coding of multiple downlink carriers. The UE calculates the number of modulation symbols occupied by the ACK/NACK of the UE according to the first carrier set, so that physical resources occupied by the ACK/NACK on the PUSCH do not change along with the downlink activated carrier set, thereby ensuring that data multiplexed with the ACK/NACK on the PUSCH is decoded correctly, and reducing the influence on data transmission performance, which, moreover, is equivalent to allocating more physical resources to the ACK/NACK to be transmitted and improving transmission performance of ACK/NACK.

For better understanding of the embodiment of the present invention, the method of the embodiment of the present invention being applied in a carrier aggregation scenario, where CSI of one or more downlink carriers is transmitted on a PUSCH, is taken as an example for further illustration.

Referring to FIG. 5, an embodiment of the present invention provides another method for transmitting uplink control information, which includes the following steps.

501: A UE sorts CSI of each carrier in X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, the X downlink carrier(s) exemplarily belong to a downlink activated carrier set of a UE, the X downlink carrier(s) may be determined according to the downlink activated carrier set of the UE, CSI configuration configured by higher layers and whether aperiodic CSI is to be reported.

The preset sorting rule may be performing sorting according to an activation sequence of downlink carriers, and when multiple downlink carriers are activated at the same time, CSI of the multiple downlink carriers activated at the same time may be sorted according to attributes of the downlink carriers. An attribute of a downlink carrier may be a carrier index or a carrier frequency. Specifically, CSI of the multiple downlink carriers activated at the same time may be sorted according to an increasing or a decreasing order of attributes of the downlink carriers. Alternatively, the preset sorting rule may be performing sorting according to an increasing or a decreasing order of attributes of downlink carriers corresponding to CSI, and an attribute of a downlink carrier may be a carrier index or a carrier frequency of the downlink carrier.

Specifically, the UE may determine original information of CSI of the X downlink carrier(s) in the downlink carrier set according to the downlink activated carrier set. Or, exemplarily, the UE may further determine whether CSI of each downlink carrier needs to be reported, according to the downlink activated carrier set, CSI configuration configured by higher layers and whether aperiodic CSI needs to be reported. If CSI needs to be reported, a corresponding reporting mode is further determined, thereby determining original information of CSI of the X downlink carrier(s) in the downlink carrier set and specific downlink carriers. For example, it is assumed that an updated downlink activated carrier set includes three downlink carriers, namely, CC1, CC2, and CC3 (it is assumed that CC3 is a latest activated downlink carrier). According to CSI configuration configured by higher layers, at this time, the CC1 and CC3 need to report CSI, and according to their respective upper-layer parameter configuration, the CC1 needs to report O₁ ^(CSI) bits, and the CC3 needs to report O₃ ^(CSI) bits. Then, the number of original information bits of CSI of the X downlink carrier(s) in the downlink carrier set is O^(CSI)=O₁ ^(CSI)+O₃ ^(CSI). The downlink carriers are specifically CC1 and CC3.

502: The UE calculates the number of modulation symbols occupied by CSI of the UE according to a first carrier set.

The first carrier set may be a downlink component carrier set of a user, a maximum downlink carrier set supportable by the UE, or a smaller one of the downlink component carrier set of the user and the maximum downlink carrier set supportable by the UE. Specifically, the UE may calculate the number of modulation symbols occupied by CSI of the UE, according to the first carrier set. Or, exemplarily, the UE may calculate the number of modulation symbols occupied by CSI of the UE, according to the first carrier set, CSI configuration configured by higher layers and whether aperiodic CSI needs to be reported, and by utilizing Formula (3).

$\begin{matrix} {Q^{\prime} = {\min\left( {\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH}\text{-}{initial}} \cdot N_{symb}^{{PUSCH}\text{-}{initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH} \cdot N_{layer}} - \frac{Q_{RI}}{Q_{m}}}} \right)}} & (3) \end{matrix}$

Q′ indicates the number of modulation symbols occupied by CSI of the UE. O indicates the total number of information bits of all CSI corresponding to the first carrier set, and is calculated based on CSI configuration configured by higher layers, whether aperiodic CSI is to be reported, and a CSI reporting mode configured by an upper layer for a downlink carrier whose CSI needs to be reported. N_(layer) indicates the total number of layers corresponding to code words to which CSI is mapped. M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of a PUSCH occupied by the same transmission block during initial transmission. M_(sc) ^(PUSCH) indicates the transmission bandwidth of the PUSCH corresponding to the current subframe. N_(symb) ^(PUSCH-initial) indicates the number of SC-FDMA symbols occupied by the same transmission block during initial transmission. N_(symb) ^(PUSCH) indicates the number of SC-FDMA symbols occupied by the current subframe. L indicates the number of CRC bits, where the value of L is 0 during RM coding of CQI, and the value of L is 8 during convolutional coding of the CQI. β_(offset) ^(PUSCH) indicates the offset of CSI relative to the data MCS, where β_(offset) ^(PUSCH)=β_(offset) ^(CSI), and the value of β_(offset) ^(CSI) is notified by upper-layer RRC signaling. C indicates the number of code blocks. K_(r) indicates a sum of the number of information bits of an r th code block and the number of CRC check bits.

503: The UE calculates the number of bits after channel coding of CSI of the UE according to the number of modulation symbols occupied by CSI of the UE.

Specifically, the number of bits after channel coding of CSI of the UE is calculated according to the number of modulation symbols Q′ occupied by CSI of the UE obtained in step 502 and by utilizing Formula (4). Q=Q _(m) ·Q′  (4)

-   -   where Q′ indicates the number of modulation symbols occupied by         CSI of the UE; Q indicates the number of bits after channel         coding of CSI of the UE; Q_(m) indicates a modulation order.

504: The UE performs channel coding for the sorted CSI of the X downlink carrier(s) according to the number of bits after channel coding of CSI of the UE, multiplexes the channel coded CSI of the X downlink carrier(s) and data on the PUSCH, and transmits the multiplexed CSI to an eNB.

Specifically, exemplarily, in the embodiment of the present invention, if the number O^(CSI) of original information bits of CSI of the X downlink carrier(s) is smaller than or equal to 11 bits, RM coding is adopted, and if greater than 11 bits, convolutional coding is adopted. Any other feasible coding method may be set according to actual application conditions, which is not specifically defined.

505: The eNB calculates the number of modulation symbols occupied by CSI, according to a first carrier set.

The first carrier set in this step is consistent with the first carrier set in step 502. If the first carrier set in step 502 is the downlink component carrier set of the user, and the first carrier set in this step is also the downlink component carrier set of the user. The method for the eNB to calculate the number of modulation symbols occupied by CSI according to the first carrier set is the same as that in step 502, which is not detailed herein again.

506: According to the number of modulation symbols occupied by CSI, the eNB extracts CSI transmitted by the UE, and calculates the number of bits after channel coding corresponding to CSI transmitted by the UE.

Because the eNB adopts the same manner as that of the UE to obtain the number of bits after channel coding corresponding to CSI transmitted by the UE, the number of HARQ-ACK bits after channel coding obtained by eNB is the same as the number of HARQ-ACK bits after channel coding obtained by UE.

507: The eNB performs channel decoding on the transmitted CSI according to the number of bits after channel coding corresponding to CSI transmitted by the UE, and determines CSI corresponding to each downlink carrier according to a preset sorting rule.

Specifically, the channel decoding method may be blind detection. The blind detection method refers to that: after receiving the transmitted CSI information, the eNB may perform blind decoding on CSI according to possible changes of the activated carrier set before or after carrier activation/deactivation, that is, determine multiple activated carrier sets according to possible changes of the activated carrier set before or after carrier activation/deactivation, calculate the number of original information bits of joint coding according to each of the determined activated carrier sets and based on the method in step 501, then perform channel decoding in combination with the calculated number of bits of CSI after joint channel coding, and determine the decoding that is with correct CRC check or a maximum likelihood function as the output of decoding output. Alternatively, any other feasible method may be adopted for decoding, which is not specifically defined.

Moreover, the preset sorting rule in this step is consistent with the preset sorting rule in step 501. If the preset sorting rule in step 501 is sorting CSI of multiple downlink carriers according to the activation sequence of the downlink carriers, the preset sorting rule in this step is also determining CSI corresponding to each downlink carrier according to the activation sequence of the downlink carriers, and CSI corresponding to each downlink carrier is determined according to this sequence.

In the method for transmitting uplink control information according to the embodiment of the present invention, the UE performs channel coding on CSI of the X downlink carrier(s) according to the obtained number of bits after channel coding of CSI of the UE, and transmits CSI of the X downlink carrier(s) to the eNB, thereby solving the problem that the eNB decodes the jointly coded CSI incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of CSI joint coding of multiple downlink carriers. Moreover, the UE sorts CSI of multiple downlink carriers according to the preset sorting rule, so that the eNB may determine CSI corresponding to each downlink carrier. Through blind detection, the eNB may further solve the problem that the eNB decodes the jointly coded CSI incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of CSI joint coding of the multiple downlink carriers. The UE calculates the number of modulation symbols occupied by CSI of the UE according to the first carrier set, so that physical resources occupied by CSI on the PUSCH do not change along with the downlink activated carrier set, thereby ensuring that data multiplexed with CSI on the PUSCH is decoded normally, and reducing the influence on data transmission performance, which, moreover, is equivalent to allocating more physical resources to CSI to be transmitted and improving transmission performance of CSI.

It should be noted that, modification may be made to step 401 or 501 and step 402 or 502 based on the embodiment shown in FIG. 4 or embodiment shown in FIG. 5, so as to solve the problem that the eNB incorrectly decodes UCI after joint channel coding due to inconsistent understanding, resulted from reconfiguration of the downlink component carrier set of the user through RRC signaling, of the UE and eNB on the number of original information bits of UCI joint channel coding of multiple downlink carriers. The modified step 401 or 501 is specifically as follows:

When a UE detects reconfiguration RRC signaling of the DL CC set, the UE updates a downlink activated carrier set; the UE sorts UCI of each downlink carrier in X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, the X downlink carrier(s) belong to the downlink activated carrier set updated by the UE, and the X downlink carrier(s) herein are all downlink carriers in the downlink carrier set updated by the UE.

The modified step 402 or 502 is specifically as follows:

The UE calculates the number of modulation symbols occupied by UCI of the UE according to a first carrier set, where the first carrier set is a maximum downlink carrier set supportable by the UE, or a smaller one of the maximum downlink carrier set supportable by the UE and a maximum downlink carrier set currently supportable by the eNB.

Other processes are similar to that in Embodiment 5 or 6, which are not detailed herein again.

In the method for transmitting uplink control information according to the embodiment of the present invention, the UE performs channel coding on UCI of the X downlink carrier(s) according to the obtained number of bits after channel coding of UCI of the UE, and transmits UCI of the X downlink carrier(s) to the eNB, thereby solving the problem that the eNB decodes the jointly coded UCI incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the UE sorts UCI of multiple downlink carriers according to the preset sorting rule, so that the eNB may determine UCI corresponding to each downlink carrier. Through a specific sorting sequence of UCI or blind detection, the eNB may further solve the problem that the eNB decodes the jointly coded UCI incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of UCI joint coding of the multiple downlink carriers. The UE calculates the number of modulation symbols occupied by UCI of the UE according to the first carrier set, so that physical resources occupied by UCI on the PUSCH do not change along with the downlink activated carrier set, thereby ensuring that data multiplexed with UCI on the PUSCH is decoded correctly, and reducing the influence on data transmission performance, which, moreover, is equivalent to allocating more physical resources to UCI to be transmitted and improving transmission performance of UCI. After the UE detects the reconfiguration RCC signaling of the DL CC set, the UE updates the downlink activated carrier set, and performs transmission similar to that of the embodiment shown in FIG. 4 or FIG. 5 based on the updated downlink activated carrier set. The maximum downlink carrier set supportable by the UE, or a smaller one of the maximum downlink carrier set supportable by the UE and the maximum downlink carrier set currently supportable by the eNB is adopted as the first carrier set, thereby solving the problem that the eNB incorrectly decodes UCI after joint channel coding due to inconsistent understanding, which is resulted from reconfiguration of the downlink component carrier set of the user through RRC signaling, of the UE and the eNB on the number of original information bits of UCI joint channel coding of multiple downlink carriers.

For better understanding of the embodiment of the present invention, the method of the embodiment of the present invention being applied in a carrier aggregation scenario, where ACK/NACK of one or more downlink carriers is transmitted on a PUCCH through multiplexing (Multiplexing), is taken as an example for further illustration.

Referring to FIG. 6, an embodiment of the present invention provides another method for transmitting uplink control information, which includes the following.

601: A UE sorts ACK/NACK of each carrier in X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, the X downlink carrier(s) belong to a downlink activated carrier set of the UE, and the X downlink carrier(s) are all downlink carriers in a downlink carrier set of the UE.

The preset sorting rule may be performing sorting according to an activation sequence of downlink carriers, and when multiple downlink carriers are activated at the same time, the ACK/NACK of the multiple downlink carriers activated at the same time may be sorted according to attributes of the downlink carriers corresponding to ACK/NACK of the downlink carriers. An attribute of a downlink carrier may be a carrier index or a carrier frequency of the downlink carrier. Specifically, the ACK/NACK of the multiple downlink carriers activated at the same time may be sorted according to an increasing or a decreasing order of attributes of the downlink carriers.

Specifically, for each downlink carrier in the X downlink carriers, if the ACK/NACK is required to be fed back, and the ACK/NACK supports spatial bundling, each downlink carrier corresponds to 1-bit ACK or NACK; if the ACK/NACK is required to be fed back, and the ACK/NACK does not support spatial bundling, each downlink carrier corresponds to 2-bit ACK or NACK. If the ACK/NACK is not required to be fed back, and the ACK/NACK supports spatial bundling, each downlink carrier corresponds to 1-bit NACK; if the ACK/NACK is not required to be fed back, and the ACK/NACK does not support spatial bundling, each downlink carrier corresponds to 2-bit NACK. The requiring the ACK/NACK to be fed back refers to that information of requiring the ACK/NACK to be fed back, such as data or PDCCH signaling indicating release of downlink SPS resources, is detected on the carrier.

The UE determines original information of the ACK/NACK of each downlink carrier in the X downlink carrier(s) according to the foregoing method, so that the total number of original information bits O^(ACK) in the X downlink carrier(s) is: O^(ACK)=X or O^(ACK)=2X. X corresponds to a scenario where the ACK/NACK supports spatial bundling, and 2X corresponds to a scenario where the ACK/NACK does not support spatial bundling.

602: The UE performs channel coding for the sorted ACK/NACK of the X downlink carrier(s) according to the preset number of bits after channel coding of ACK/NACK of the UE, maps the channel coded ACK/NACK of the X downlink carriers after channel coding to a PUCCH channel, and transmits the mapped ACK/NACK to an eNB.

The preset number of bits after channel coding of the ACK/NACK of the UE is a positive integer, which, for example, may be 20. In addition, in this embodiment of the present invention, exemplarily, RM coding is adopted for channel coding, and in actual applications, any other feasible channel coding manner may be adopted according to specific conditions, which is not specifically defined.

603: The eNB performs detection on the transmitted ACK/NACK through PUCCH detection, and determines ACK/NACK corresponding to each downlink carrier according to a preset sorting rule.

The preset sorting rule in this step is consistent with the preset sorting rule in step 601. Moreover, specifically, a channel decoding method during the process of detecting the transmitted ACK/NACK by the eNB may be:

-   -   performing channel decoding on the transmitted ACK/NACK by         adopting a method corresponding to that of the coding in step         602 and according to the preset number of bits after channel         coding; or     -   performing decoding through a blind decoding method, where the         blind decoding method refers to that: after receiving the         transmitted ACK/NACK information, the eNB may perform blind         decoding on the ACK/NACK according to possible changes of the         downlink activated carrier set before or after carrier         activation/deactivation, that is, determine multiple downlink         activated carrier sets according to possible changes of the         downlink activated carrier set before or after carrier         activation/deactivation, perform channel decoding according to         each of the determined downlink activated carrier sets and in         combination with the preset number of bits after channel coding,         and determine the decoding that is with a maximum likelihood         function as the output of decoding.

It should be noted that, if the eNB does not adopt the blind decoding to decode the transmitted ACK/NACK, when the eNB needs to deactivate a downlink carrier, the eNB deactivates a carrier included in the downlink activated carrier set, according to a sequence that a carrier activated later is deactivated earlier. Then, according to the updated downlink activated carrier set, the UE repeats steps 601 and 602 to transmit the ACK/NACK of the X downlink carriers.

It should be noted that, when the ACK/NACK of the X downlink carrier(s) is sorted according to the sequence of arranging a downlink carrier activated earlier in the front, and arranging a downlink carrier activated later in the back, the ACK/NACK of the latest activated downlink carrier is arranged in the last place. The latest activated downlink carrier during a fuzzy period is usually NACK, and according to the characteristic of RM coding, the NACK arranged in the last place does not contribute to the coded bits of ACK/NACK. Therefore, even if the eNB performs decoding based on less or more bits, correctness of the ACK/NACK that truly needs to be transmitted can still be ensured. For example, the downlink activated carrier set has three downlink carriers, where the last downlink carrier is the latest activated downlink carrier, and each downlink carrier supports ACK/NACK spatial bundling. Then, the total number of bits of the ACK/NACK jointly coded according to RM coding is 3. It is assumed that the first two downlink carriers both need to transmit ACK, and the last downlink carrier transmits NACK because it is just activated and has no scheduling data. Then, three bits transmitted on the PUSCH are 110, and according to the characteristic of RM coding, the bits of 110 after coding are consistent with the bits of 11 after coding. Therefore, even if the eNB does not learn that the UE has successfully detected an activation command of a downlink carrier 3 and has updated the total number of bits of the jointly coded ACK/NACK, and still decodes the transmitted ACK/NACK based on 2 bits, it is still ensured that the first 2 bits are decoded correctly.

In the method for transmitting uplink control information according to the embodiment of the present invention, the UE performs channel coding on the ACK/NACK of the X downlink carrier(s) according to the preset number of bits after channel coding of ACK/NACK of the UE, and transmits the ACK/NACK of the X downlink carrier(s) to the eNB, thereby solving the problem that the eNB decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of ACK/NACK joint coding of multiple downlink carriers. Moreover, the UE sorts the ACK/NACK of multiple downlink carriers according to the preset sorting rule, so that the eNB may determine ACK/NACK corresponding to each downlink carrier. Further, when the eNB does not adopt blind decoding, the UE sorts the ACK/NACK of each carrier by utilizing the characteristic of RM coding and according to an activation sequence of the downlink carriers, and the eNB deactivates a downlink carrier included in the downlink activated carrier set according to the sequence that a carrier activated later is deactivated earlier, thereby ensuring the correct decoding of the ACK/BACK that truly needs to be transmitted even if the eNB and UE have inconsistent understanding on the total number of information bits of the jointly coded ACK/NACK, and solving the problem that the eNB decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of ACK/NACK joint coding of multiple downlink carriers. If the eNB adopts the blind detection, the sequence of deactivating the carriers does not need to be confined, and the problem that the eNB decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of ACK/NACK joint coding of multiple downlink carriers can be further solved.

When the UE has uplink data required to be sent but has no uplink resources, the UE sends an SR (Scheduling Request, scheduling request) to the eNB to request resource allocation. In the carrier aggregation scenario, a specific uplink carrier of the UE is semi-statically configured to send the SR and ACK/NACK. When the SR and the ACK/NACK of the X downlink carrier(s) are reported on the same uplink frame at the same time, the SR and the ACK/NACK of the X downlink carrier(s) may undergo joint channel coding before being transmitted. Based on the foregoing scenario, referring to FIG. 7, an embodiment of the present invention provides another method for transmitting uplink control information, where the method includes the following.

701: A UE sorts an SR and ACK/NACK of X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, the X downlink carrier(s) belong to a downlink activated carrier set of the UE, and the X downlink carrier(s) herein are all downlink carriers in a downlink carrier set of the UE.

The preset sorting rule in the embodiment of the present invention is: performing sorting according to a sequence of arranging the SR first, and then arranging the ACK/NACK of each downlink carrier in the X downlink carrier(s) after the SR based on an activation sequence of the downlink carriers. Moreover, when multiple downlink carriers are activated at the same time, ACK/NACK of the multiple downlink carriers activated at the same time may be sorted according to attributes of the downlink carriers corresponding to ACK/NACK of the downlink carriers. An attribute of a downlink carrier may be a carrier index or a carrier frequency of the downlink carrier. Specifically, the ACK/NACK of the multiple downlink carriers activated at the same time may be sorted according to an increasing or a decreasing order of the attributes of the downlink carriers.

Specifically, for each downlink carrier in the X downlink carriers, if ACK/NACK is required to be fed back, and the ACK/NACK supports spatial bundling, each downlink carrier corresponds to 1-bit ACK or NACK; if the ACK/NACK is required to be fed back, and the ACK/NACK does not support spatial bundling, each downlink carrier corresponds to 2-bit ACK or NACK. If the ACK/NACK is not required to be fed back, and the ACK/NACK supports spatial bundling, each downlink carrier corresponds to 1-bit NACK; if the ACK/NACK is not required to be fed back, and the ACK/NACK does not support spatial bundling, each downlink carrier corresponds to 2-bit NACK. The requiring the ACK/NACK to be fed back refers to that information of requiring the ACK/NACK to be fed back, such as data or PDCCH signaling indicating release of downlink SPS resources, is detected on the carrier.

The UE determines original information of the ACK/NACK of each downlink carrier in the X downlink carrier(s) according to the foregoing method, so that the total number of original information bits O^(ACK) in the X downlink carrier(s) is: O^(ACK)=X or O^(ACK)=2X. X corresponds to a scenario where the ACK/NACK supports spatial bundling, and 2X corresponds to a scenario where the ACK/NACK does not support spatial bundling. The total number of original information bits of joint coding is obtained according to the total number of original information bits in the X downlink carrier(s) and original information of the SR.

702: The UE performs channel coding for the sorted SR and ACK/NACK of the X downlink carrier(s) according to the preset number of bits after channel coding of ACK/NACK of the UE, maps the channel coded SR and ACK/NACK to a PUCCH channel, and transmits the mapped SR and ACK/NACK to an eNB.

Step 702 is similar to step 602, which is not detailed herein again.

703: The eNB performs detection on the transmitted SR and ACK/NACK through PUCCH detection, and determines the SR and ACK/NACK that is corresponding to each downlink carrier.

Step 703 is similar to step 603, which is not detailed herein again.

With the method for transmitting uplink control information according to the embodiment of the present invention, not only the problem similar to that of the embodiment shown in FIG. 6 is solved, but also correct transmission of the SR is ensured.

Referring to FIG. 8, an embodiment of the present invention provides another method for transmitting uplink control information, which includes the following.

801: A UE receives carrier activation command/deactivation command, and determines whether to activate a carrier and/or deactivate a carrier; for an activated carrier, adds the newly activated carrier to an original downlink activated carrier set and performs 802; and for a deactivated carrier, performs 807.

802: The UE sorts ACK/NACK of each carrier in X downlink carrier(s) according to a preset sorting rule.

Step 802 is similar to step 401, which is not detailed herein again.

803: The UE calculates, according to a first carrier set, the number of modulation symbols occupied by ACK/NACK of the UE; and the UE calculates the number of bits after channel coding of the ACK/NACK of the UE according to the number of modulation symbols occupied by the ACK/NACK of the UE.

Step 803 is similar to step 402 and step 403, which is not detailed herein again.

804: The UE performs channel coding for the sorted ACK/NACK of the X downlink carrier(s) according to the number of bits after channel coding of the ACK/NACK of the UE, multiplexes the channel coded ACK/NACK of the X downlink carrier(s) with data on a PUSCH, and transmits the multiplexed ACK/NACK of the X downlink carrier(s) after channel coding to an eNB.

Step 804 is similar to step 404, which is not detailed herein again.

805: The eNB calculates, according to the first carrier set, the number of modulation symbols occupied by the ACK/NACK; and the eNB extracts, according to the number of modulation symbols occupied by the ACK/NACK, ACK/NACK transmitted by the UE, and calculates the number of bits after channel coding corresponding to the ACK/NACK transmitted by the UE.

Step 805 is similar to step 405 and step 406, which is not detailed herein again.

806: The eNB performs channel decoding on the transmitted ACK/NACK according to the number of bits after channel coding corresponding to the ACK/NACK transmitted by the UE, and determines ACK/NACK corresponding to each downlink carrier according to a preset sorting rule.

Step 806 is similar to step 407, which is not detailed herein again.

807: The UE determines whether at least one carrier implicit deactivation timer times out; if at least one carrier implicit deactivation timer times out, performs 808; otherwise, performs 802.

808: The UE updates the downlink activated carrier set to be the downlink activated carrier set that has undergone deactivation, and performs 802.

In the method for transmitting uplink control information according to the embodiment of the present invention, for the case of carrier activation, by utilizing the characteristic of RM coding, the UE sorts the ACK/NACK of each carrier according to the activation sequence of the carriers, and always starts carrier deactivation from the last one in the activated carrier set, so as to ensure that even if the base station and the UE have inconsistent understanding on the total number of information bits of the jointly coded ACK/NACK, the ACK/NACK that truly needs to be transmitted is also correctly decoded, thereby solving the problem that the base station decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of ACK/NACK joint coding of multiple downlink carriers. Meanwhile, the UE calculates, according to the first carrier set, the number of modulation symbols occupied by the ACK/NACK of the X downlink carriers, so that physical resources occupied by the ACK/NACK on the PUSCH do not change along with the downlink activated carrier set, so as to ensure that the data multiplexed with the ACK/NACK on the PUSCH is decoded correctly, and the influence on data transmission performance is reduced, which, moreover, is equivalent to allocating more physical resources to the ACK/NACK to be transmitted and improving transmission performance of the ACK/NACK. For the case of carrier deactivation, in combination with the implicit mechanism of carrier deactivation, the problem that the base station decodes the jointly coded ACK/NACK incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of ACK/NACK joint coding of multiple downlink carriers is solved.

Referring to FIG. 9, an embodiment of the present invention provides another method for transmitting uplink control information, which includes the following.

901: A UE receives carrier activation/deactivation command in a downlink subframe n; the UE uses a downlink activated carrier set before reception of the carrier activation command/deactivation command as a current downlink activated carrier set; the UE sorts UCI of each downlink carrier in X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, and the X downlink carrier(s) belong to the current downlink activated carrier set of the UE.

Specifically, when UCI is ACK/NACK, the X downlink carrier(s) are all downlink carriers in the downlink carrier set of the UE; when UCI is CSI, the X downlink carrier(s) may be determined according to the downlink activated carrier set of the UE, CSI configuration configured by higher layers and whether aperiodic CSI is to be reported.

The process that the UE sorts UCI of each downlink carrier in the X downlink carrier(s) according to the preset sorting rule is similar to step 401 when UCI is ACK/NACK, and is similar to step 501 when UCI is CSI, which is not described in detail herein again.

902: The UE transmits UCI of the X downlink carrier(s) to an eNB, and the eNB processes the received UCI of the X downlink carriers.

Specifically, when UCI is ACK/NACK, step 902 may be implemented by adopting the method of steps 402 to 407 or steps 602 and 603. When UCI is CSI, step 902 may be implemented by adopting the method of steps 502 to 507.

It should be noted that, when the UE adopts the method similar to step 402 or 502 to calculate the number of modulation symbols occupied by UCI of the UE in this step, the first carrier set may further be the downlink activated carrier set before the carrier activation command/deactivation command is sent on the downlink subframe n; when the eNB adopts the method similar to step 405 or 505 to calculate the number of modulation symbols occupied by UCI in this step, the first carrier set may further be the downlink activated carrier set before the eNB sends the carrier activation/deactivation command in the downlink subframe n.

903: Starting from a first effective uplink subframe n+k, the UE uses the updated downlink activated carrier set (that is, the downlink activated carrier set updated after the UE receives the carrier activation/deactivation command in the downlink subframe n) as a current downlink activated carrier set, and the UE sorts UCI of each downlink carrier in the X downlink carrier(s) according to a preset sorting rule, where X is a positive integer, and the X downlink carrier(s) belong to the current downlink activated carrier set of the UE. k indicates the number of delayed subframes, and k is a positive integer.

The first effective uplink subframe n+k refers to a first uplink subframe which needs to report UCI and which the UE encounters after k subframes since the subframe n on which the UE receives the carrier activation command/deactivation command. A specific value of k may be selected according to an actual situation, for example, k is greater than or equal to 5.

Specifically, when UCI is ACK/NACK, the X downlink carrier(s) are all downlink carriers in the downlink carrier set of the UE; when UCI is CSI, the X downlink carrier(s) may be determined according to the downlink activated carrier set of the UE, CSI configuration configured by higher layers and whether aperiodic CSI is to be reported.

The process that the UE sorts UCI of each downlink carrier in the X downlink carrier(s) according to the preset sorting rule is similar to step 401 when UCI is ACK/NACK, and is similar to step 501 when UCI is CSI, which is not described in detail herein again.

It should be noted that, in this step, starting from the first effective uplink subframe n+k, the UE uses the updated downlink activated carrier set (that is, the downlink activated carrier set updated after the UE receives the carrier activation/deactivation command in the downlink subframe n) as the current downlink activated carrier set, until the update needs to be performed again according to new carrier activation command/deactivation command.

904: The UE transmits UCI of the X downlink carrier(s) to an eNB, and the eNB processes the received UCI of the X downlink carriers.

Specifically, when UCI is ACK/NACK, step 904 may be implemented by adopting the method of steps 401 to 407 or steps 601 to 603. When UCI is CSI, step 904 may be implemented by adopting the method of steps 501 to 507.

In the method for transmitting uplink control information according to the embodiment of the present invention, when the UE reports UCI, by delaying effective time of the carrier activation command/deactivation command, the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the UE and eNB on the total number of original information bits of UCI joint coding of multiple downlink carriers is solved.

Referring to FIG. 10, an embodiment of the present invention provides an user equipment, where the user equipment includes:

-   -   a first uplink control information processing module 1001,         configured to sort UCI of each downlink carrier in X downlink         carrier(s) according to a preset sorting rule, where X is a         positive integer, the X downlink carrier(s) belong to a downlink         component carrier set of the user equipment, the downlink         component carrier set of the user equipment at least includes         two downlink component carriers, and at least one downlink         carrier in the X downlink carrier(s) belongs to a downlink         activated carrier set of the user equipment;     -   a first module for acquiring the number of modulation symbols         1002, configured to calculate the number of modulation symbols         occupied by UCI of the user equipment according to a first         carrier set, where the first carrier set is one of the following         sets: the downlink component carrier set of the user equipment,         a maximum downlink carrier set supportable by the user         equipment, and a smaller one of the downlink component carrier         set of the user equipment and the maximum downlink carrier set         supportable by the user equipment;     -   a first module for acquiring the number of bits after channel         coding 1003, configured to: after the first module for acquiring         the number of modulation symbols 1002 obtains the number of         modulation symbols occupied by UCI of the user equipment,         calculate the number of bits after channel coding of UCI of the         user equipment according to the number of modulation symbols         occupied by UCI of the user equipment; and     -   a first coding and transmission module 1004, configured to:         after the first module for acquiring the number of bits after         channel coding 1003 obtains the number of bits after channel         coding of UCI of the user equipment, perform channel coding for         the sorted UCI of the X downlink carrier(s) according to the         number of bits after channel coding of UCI of the user         equipment, map the sorted UCI of the X downlink carrier(s) after         channel coding to a physical channel and transmit the sorted UCI         of the X downlink carrier(s) to an eNB.

Further, the first uplink control information processing module 1001 is specifically configured to: when UCI of the user equipment is hybrid automatic repeat request HARQ acknowledgment information, sort UCI of all downlink carriers in the downlink activated carrier set according to the preset sorting rule.

Further, the first uplink control information processing module 1001 is specifically configured to: when UCI of the user equipment is channel state information CSI, sort, according to the preset sorting rule, UCI of each downlink carrier in the X downlink carrier(s) that are determined according to CSI configuration configured by higher layers and whether aperiodic CSI is to be reported, where the X downlink carrier(s) belong to the downlink activated carrier set of the user equipment.

Further, the first uplink control information processing module 1001 includes one of the following units:

-   -   a first sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to an increasing         order of attributes of downlink carriers corresponding to UCI of         the downlink carriers, where an attribute of a downlink carrier         is a carrier index or a carrier frequency;     -   a second sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to a decreasing         order of attributes of downlink carriers corresponding to UCI of         the downlink carriers, where an attribute of a downlink carrier         is a carrier index or a carrier frequency;     -   a third sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to an activation         sequence of the downlink carriers.

Further, the third sorting unit is specifically configured to: when UCI of each downlink carrier in the X downlink carrier(s) is sorted according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, sort UCI of the multiple downlink carriers activated at the same time, according to the increasing or decreasing order of the attributes of the downlink carriers, where the attribute of the downlink carrier is a carrier index or a carrier frequency.

Further, the first module for acquiring the number of modulation symbols 1002 includes:

-   -   a unit for calculating the number of modulation symbols,         configured to: when UCI is channel state information CSI,         calculate the number of modulation symbols occupied by CSI of         the user equipment, according to the first carrier set, CSI         configuration configured by higher layers and whether aperiodic         CSI is to be reported.

In the user equipment according to the embodiment of the present invention, the user equipment performs channel coding on UCI of the X downlink carrier(s) according to the acquired number of bits after channel coding of UCI of the user equipment, and transmits UCI of the X downlink carrier(s) to a base station, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the user equipment and base station on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the user equipment sorts UCI of the multiple downlink carriers according to the preset sorting rule, so that the base station may determine UCI corresponding to each downlink carrier.

Referring to FIG. 11, an embodiment of the present invention provides anther user equipment, where the user equipment includes:

-   -   a second uplink control information processing module 1101,         configured to sort UCI of each downlink carrier in X downlink         carrier(s) according to a preset sorting rule, where X is a         positive integer, and the X downlink carrier(s) belong to a         downlink activated carrier set of the user equipment; and     -   a second coding and transmission module 1102, configured to:         after the second uplink control information processing module         sorts UCI of each downlink carrier in the X downlink carriers,         perform channel coding for the sorted UCI of the X downlink         carrier(s) according to the preset number of bits after channel         coding of the of the user equipment, map the sorted UCI of the X         downlink carrier(s) to a physical channel and transmit the         sorted UCI of the X downlink carrier(s) to a base station.

Further, when UCI of the user equipment is hybrid automatic repeat request HARQ acknowledgment information, the X downlink carrier(s) are all downlink carriers in the downlink activated carrier set of the user equipment.

Further, the second uplink control information processing module 1101 includes:

-   -   a fourth sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to an activation         sequence of the downlink carriers.

Further, the fourth sorting unit is specifically configured to: when UCI of the X downlink carrier(s) and a scheduling request SR are reported on the same subframe, first arrange the SR, and then arrange UCI of each downlink carrier in the X downlink carrier(s) after the SR according to an activation sequence of the downlink carriers.

Further, when UCI of each downlink carrier in the X downlink carrier(s) is sorted according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to attributes of the downlink carriers, where an attribute of a downlink carrier is a carrier index or a carrier frequency.

In the user equipment according to the embodiment of the present invention, the user equipment performs channel coding on original information of UCI of the X downlink carrier(s) according to the total original information of UCI of the X downlink carriers, determined based on the downlink activated carrier set, and the preset number of original information bits after channel coding of UCI of the X downlink carriers, and transmits the original information of UCI of the X downlink carrier(s) to the base station, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the user equipment and base station on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the user equipment sorts UCI of multiple downlink carriers according to the preset sorting rule, so that the base station may determine UCI corresponding to each downlink carrier.

Referring to FIG. 12, an embodiment of the present invention provides an base station, where the base station includes:

-   -   a first module for acquiring the number of UCI modulation         symbols 1201, configured to calculate, according to a first         carrier set, the number of modulation symbols occupied by uplink         control information UCI, where the first carrier set is one of         the following sets: a downlink component carrier set of a user         equipment, a maximum downlink carrier set supportable by the         user equipment, and a smaller one of the downlink component         carrier set of the user equipment and the maximum downlink         carrier set supportable by the user equipment, and the downlink         component carrier set of the user equipment at least includes         two downlink component carriers;     -   a first module for acquiring the number of bits after UCI         channel coding 1202, configured to: after the first module for         acquiring the number of UCI modulation symbols 1201 obtains the         number of modulation symbols occupied by UCI, extract, according         to the number of modulation symbols occupied by UCI, UCI         transmitted by the UE, and calculate the number of bits after         channel coding corresponding to the transmitted UCI; and     -   a first UCI determination module 1203, configured to: after the         first module for acquiring the number of bits after UCI channel         coding 1202 obtains the number of bits after channel coding         corresponding to the transmitted UCI, perform channel decoding         on the transmitted UCI according to the number of bits after         channel coding corresponding to the transmitted UCI, and         determine UCI corresponding to each downlink carrier according         to a preset sorting rule.

Further, the first module for acquiring the number of UCI modulation symbols 1201 includes:

-   -   a first CSI modulation symbol number acquisition unit,         configured to: when UCI is channel state information CSI,         calculate the number of modulation symbols occupied by CSI,         according to the first carrier set, CSI configuration configured         by higher layers and whether aperiodic CSI is to be reported.

Further, the preset sorting rule includes one of the following rules:

-   -   performing sorting according to an increasing order of         attributes of downlink carriers corresponding to UCI of the         downlink carriers, where an attribute of a downlink carrier is a         carrier index or a carrier frequency;     -   performing sorting according to a decreasing order of attributes         of downlink carriers corresponding to UCI of the downlink         carriers, where an attribute of a downlink carrier is a carrier         index or a carrier frequency;     -   performing sorting according to an activation sequence of the         downlink carriers.

Further, when the preset sorting rule is performing sorting according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to the increasing or decreasing order of the attributes of the downlink carriers, where the attribute of the downlink carrier is a carrier index or a carrier frequency.

In the base station according to the embodiment of the present invention, the base station obtains, according to the first carrier set, the number of modulation symbols occupied by UCI, extracts, according to the number of modulation symbols occupied by UCI, UCI transmitted by the user equipment, and obtains the number of bits after channel coding corresponding to the transmitted UCI, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the base station and the user equipment on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the base station may determine UCI corresponding to each downlink carrier according to the preset sorting rule.

Referring to FIG. 13, an embodiment of the present invention provides another base station, where the base station includes:

-   -   a second UCI determination module 1301, configured to, according         to the preset number of bits after channel coding corresponding         to uplink control information UCI, perform detection on UCI         transmitted by a UE, and determine UCI corresponding to each         downlink carrier according to a preset sorting rule.

Further, when the preset sorting rule is performing sorting according to an activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to an increasing or a decreasing order of attributes of the downlink carriers.

Further, the second UCI determination module 1301 includes:

-   -   a second UCI determination module 1301 a, configured to: when         UCI and a scheduling request SR are reported on the same         subframe, determine the SR and UCI corresponding to each         downlink carrier according to a sequence of arranging the SR         first, and then arranging UCI of X downlink carrier(s) after the         SR based on an activation sequence of the downlink carriers.

In the base station according to the embodiment of the present invention, the base station performs detection on UCI transmitted by the user equipment, according to the preset number of bits after channel coding corresponding to the uplink control information UCI, thereby solving the problem that eNB decodes the jointly coded UCI incorrectly due to inconsistent understanding of the base station and the user equipment on the total number of original information bits of UCI joint coding of multiple downlink carriers. UCI corresponding to each downlink carrier may be determined according to the preset sorting rule.

Referring to FIG. 14, an embodiment of the present invention provides a system for transmitting uplink control information, where the system includes a user equipment 1401 and a base station 1402.

The user equipment 1401 includes:

-   -   a first uplink control information processing module 1401 a,         configured to sort UCI of each downlink carrier in X downlink         carrier(s) according to a preset sorting rule, where X is a         positive integer, the X downlink carrier(s) belong to a downlink         component carrier set of the user equipment, the downlink         component carrier set of the user equipment at least includes         two downlink component carriers, and at least one downlink         carrier in the X downlink carrier(s) belongs to a downlink         activated carrier set of the user equipment;     -   a first module for acquiring the number of modulation symbols         1401 b, configured to, according to a first carrier set,         calculate the number of modulation symbols occupied by UCI of         the user equipment, where the first carrier set is one of the         following sets: the downlink component carrier set of the user         equipment, a maximum downlink carrier set supportable by the         user equipment, and a smaller one of the downlink component         carrier set of the user equipment and the maximum downlink         carrier set supportable by the user equipment;     -   a first module for acquiring the number of bits after channel         coding 1401 c, configured to: after the first module for         acquiring the number of modulation symbols 1401 b obtains the         number of modulation symbols occupied by UCI of the user         equipment, calculate the number of bits after channel coding of         UCI of the user equipment according to the number of modulation         symbols occupied by UCI of the user equipment; and     -   a first coding and transmission module 1401 d, configured to:         after the first module for acquiring the number of bits after         channel coding 1401 c obtains the number of bits after channel         coding of UCI of the user equipment, perform channel coding for         the sorted UCI of the X downlink carrier(s) according to the         number of bits after channel coding of UCI of the user         equipment, map the sorted UCI of the X downlink carrier(s) to a         physical channel and transmit the sorted UCI of the X downlink         carrier(s) to the base station 1402.

The base station 1402 includes:

-   -   a first module for acquiring the number of UCI modulation         symbols 1402 a, configured to, according to a first carrier set,         calculate the number of modulation symbols occupied by uplink         control information UCI, where the first carrier set is one of         the following sets: the downlink component carrier set of the         user equipment, the maximum downlink carrier set supportable by         the user equipment, and a smaller one of the downlink component         carrier set of the user equipment and the maximum downlink         carrier set supportable by the user equipment, and the downlink         component carrier set of the user equipment at least includes         two downlink component carriers; a first module for acquiring         the number of bits after UCI channel coding 1402 b, configured         to: after the first module for acquiring the number of UCI         modulation symbols 1402 a obtains the number of modulation         symbols occupied by UCI, extract, according to the number of         modulation symbols occupied by UCI, UCI transmitted by the UE,         and calculate the number of bits after channel coding         corresponding to the transmitted UCI; and     -   a first UCI determination module 1402 c, configured to: after         the first module for acquiring the number of bits after UCI         channel coding 1402 b obtains the number of bits after channel         coding corresponding to the transmitted UCI, perform channel         decoding on the transmitted UCI according to the number of bits         after channel coding corresponding to the transmitted UCI, and         determine UCI corresponding to each downlink carrier according         to a preset sorting rule.

Further, the first uplink control information processing module is specifically configured to: when UCI of the user equipment is hybrid automatic repeat request HARQ acknowledgment information, sort UCI of all downlink carriers in the downlink activated carrier set according to the preset sorting rule.

Further, the first uplink control information processing module is specifically configured to: when UCI of the user equipment is channel state information CSI, sort, according to the preset sorting rule, UCI of each downlink carrier in the X downlink carrier(s) that are determined based on CSI configuration configured by higher layers and whether aperiodic CSI is to be reported, where the X downlink carrier(s) belong to the downlink activated carrier set of the user equipment.

Further, the first uplink control information processing module 1401 a includes one of the following units:

-   -   a first sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to an increasing         order of attributes of downlink carriers corresponding to UCI of         the downlink carriers, where an attribute of a downlink carrier         is a carrier index or a carrier frequency;     -   a second sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to a decreasing         order of attributes of downlink carriers corresponding to UCI of         the downlink carriers, where an attribute of a downlink carrier         is a carrier index or a carrier frequency;     -   a third sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to an activation         sequence of the downlink carriers.

Further, the third sorting unit is specifically configured to: when UCI of each downlink carrier in the X downlink carrier(s) is sorted according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, sort UCI of the multiple downlink carriers activated at the same time, according to the increasing or decreasing order of the attributes of the downlink carriers, where the attribute of the downlink carrier is a carrier index or a carrier frequency.

Further, the first module for acquiring the number of modulation symbols 1401 b includes:

-   -   a unit for calculating the number of modulation symbols,         configured to: when UCI is channel state information CSI,         calculate the number of modulation symbols occupied by CSI of         the user equipment, according to the first carrier set, CSI         configuration configured by higher layers and whether aperiodic         CSI is to be reported.

Further, the first carrier set may be the downlink component carrier set of the user equipment, the maximum downlink carrier set supportable by the user equipment, or a smaller one of the downlink component carrier set of the user equipment and the maximum downlink carrier set supportable by the user equipment.

Further, the first module for acquiring the number of UCI modulation symbols 1402 a includes:

-   -   a first CSI modulation symbol number acquisition unit,         configured to: when UCI is channel state information CSI,         calculate the number of modulation symbols occupied by CSI,         according to the first carrier set, CSI configuration configured         by higher layers and whether aperiodic CSI is to be reported.

In the system for transmitting uplink control information according to the embodiment of the present invention, the user equipment performs channel coding on UCI of the user equipment according to the acquired number of bits after channel coding of UCI of the user equipment, and transmits UCI to the base station, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the user equipment and base station on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the user equipment sorts UCI of multiple downlink carriers according to the preset sorting rule, so that the base station may determine UCI corresponding to each downlink carrier.

Referring to FIG. 15, an embodiment of the present invention provides another system for transmitting uplink control information, where the system includes a user equipment 1501 and a base station 1502.

The user equipment 1501 includes:

-   -   a second uplink control information processing module 1501 a,         configured to sort UCI of each downlink carrier in X downlink         carrier(s) according to a preset sorting rule, where X is a         positive integer, and the X downlink carrier(s) belong to a         downlink activated carrier set of the user equipment; and     -   a second coding and transmission module 1501 b, configured to:         after the second uplink control information processing module         1501 a sorts UCI of each downlink carrier in the X downlink         carriers, perform channel coding for the sorted UCI of the X         downlink carrier(s) according to the preset number of bits after         channel coding of UCI of the user equipment, map the sorted UCI         of the X downlink carrier(s) to a physical channel and transmit         the sorted UCI of the X downlink carrier(s) to a base station         1502.

The base station 1502 includes:

-   -   a second UCI determination module 1502 a, configured to,         according to the preset number of bits after channel coding         corresponding to uplink control information UCI, perform         detection on UCI transmitted by the user equipment 1501, and         determine UCI corresponding to each downlink carrier according         to a preset sorting rule.

Further, the second uplink control information processing module 1501 a includes:

-   -   a fourth sorting unit, configured to sort UCI of each downlink         carrier in the X downlink carrier(s) according to an activation         sequence of the downlink carriers.

Further, the second uplink control information processing module 1501 a includes:

-   -   a fifth sorting unit, configured to: when UCI of the X downlink         carrier(s) and a scheduling request SR are reported on the same         subframe, first arrange the SR, and then arrange UCI of each         downlink carrier in the X downlink carrier(s) after the SR         according to an activation sequence of the downlink carriers.

Further, when UCI of each downlink carrier in the X downlink carrier(s) is sorted according to the activation sequence of the downlink carriers, if multiple downlink carriers are activated at the same time, UCI of the multiple downlink carriers activated at the same time is sorted according to attributes of the downlink carriers, where an attribute of a downlink carrier is a carrier index or a carrier frequency.

Further, the second UCI determination module 1502 a comprises:

-   -   a second UCI determination unit, configured to: when UCI and a         scheduling request SR are reported on the same subframe,         determine the SR and UCI corresponding to each downlink carrier         according to a sequence of arranging the SR first, and then         arranging UCI of the X downlink carrier(s) after the SR based on         an activation sequence of the downlink carriers.

In the system for transmitting uplink control information according to the embodiment of the present invention, the user equipment performs channel coding on original information of UCI of the X downlink carrier(s) through the total original information of UCI of the X downlink carrier(s) determined according to the downlink activated carrier set and through the preset number of bits after channel coding of UCI of the X downlink carriers, and transmits the original information of UCI of the X downlink carrier(s) to the base station, thereby solving the problem that the base station decodes the jointly coded UCI incorrectly due to inconsistent understanding of the user equipment and base station on the total number of original information bits of UCI joint coding of multiple downlink carriers. Moreover, the user equipment sorts UCI of multiple downlink carriers according to the preset sorting rule, so that the base station may determine UCI corresponding to each downlink carrier.

All or part of the content in the technical solutions provided in the foregoing embodiments may be implemented by software programs, and the software programs are stored in readable storage media, such as a computer hard disk, a CD-ROM, or a floppy disk.

The foregoing describes only exemplary embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the idea and principle of the present invention shall fall within the protection scope of the present invention. 

What is claimed is:
 1. A method for transmitting uplink control information (UCI) by a user equipment device (UE), comprising: sorting uplink control information (UCI) of multiple downlink component carriers in a downlink component carrier set configured for the UE according to an attribute of each downlink component carrier, wherein at least one downlink component carrier of the downlink component carrier set belongs to a downlink activated carrier set of the UE; determining a quantity of modulation symbols for the UCI according to the downlink component carrier set; determining a quantity of bits for channel coding the UCI according to the quantity of modulation symbols determined for the UCI; channel coding the sorted UCI according to the quantity of bits for channel coding the UCI; modulating the channel coded UCI; and transmitting the modulated and channel coded UCI to one or more base stations in communication with the UE; wherein the quantity of the modulation symbols for the UCI is determined according to the following formula: $Q^{\prime} = {\min\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}$ where Q′ indicates the number of modulation symbols, O indicates a total number of information bits of all UCI corresponding to the downlink component carrier set and is equal to or larger than 2, M indicates the number of carriers included in the downlink component carrier set, N_(layer) indicates a total number of layers corresponding to code words to which the UCI is mapped, M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of a physical uplink shared channel (PUSCH) during initial transmission of the same transmission block, M_(sc) ^(PUSCH) indicates the transmission bandwidth of the PUSCH corresponding to a current subframe, N_(symb) ^(PUSCH-initial) indicates a number of Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols occupied by the same transmission block during initial transmission, and β_(offset) ^(PUSCH) indicates an offset of the UCI relative to a data Modulation and Coding Scheme (MSC).
 2. The method according to claim 1, wherein the attribute of each downlink component carrier is a carrier index or a carrier frequency.
 3. A method for obtaining uplink control information (UCI) by a base station, comprising: obtaining channel coded and modulated uplink control information (UCI) from a user equipment device (UE), wherein a downlink component carrier set is configured for the UE, at least one downlink component carrier of the downlink component carrier set belongs to a downlink activated carrier set of the UE; determining a quantity of modulation symbols for the UCI according to the downlink component carrier set; demodulating and channel decoding the modulated and channel coded UCI according to the quantity of modulation symbols for the UCI; and obtaining UCI of each downlink component carrier of the downlink component carrier set according to an attribute of each downlink component carrier; wherein the quantity of the modulation symbols for the UCI is determined according to the following formula: $Q^{\prime} = {\min\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}$ where Q′ indicates the number of modulation symbols, O indicates a total number of information bits of all UCI corresponding to the downlink component carrier set and is equal to or larger than 2, M indicates the number of carriers included in the downlink component carrier set, N_(layer) indicates a total number of layers corresponding to code words to which the UCI is mapped, M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of a physical uplink shared channel (PUSCH) during initial transmission of the same transmission block, M_(sc) ^(PUSCH) indicates the transmission bandwidth of the PUSCH corresponding to a current subframe, N_(symb) ^(PUSCH-initial) indicates a number of Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols occupied by the same transmission block during initial transmission, and β_(offset) ^(PUSCH) indicates an offset of the UCI relative to a data Modulation and Coding Scheme (MSC).
 4. The method according to claim 3, wherein the attribute of each downlink component carrier is a carrier index or a carrier frequency.
 5. A user equipment device (UE), comprising: a processor and a transmitter, wherein the processor is configured to: sort uplink control information (UCI) of multiple downlink component carriers in a downlink component carrier set configured for a user equipment (UE) according to an attribute of each downlink component carrier, wherein at least one downlink component carrier of the downlink component carrier set belongs to a downlink activated carrier set of the UE; determine a quantity of modulation symbols for the UCI according to the downlink component carrier set; determine a quantity of bits for channel coding the UCI according to the quantity of modulation symbols determined for the UCI; channel code the sorted UCI according to the quantity of bits for channel coding the UCI; and modulate the channel coded UCI; wherein the transmitter is configured to: transmit the modulated and channel coded UCI to one or more base stations in communication with the UE; wherein the quantity of the modulation symbols for the UCI is determined according to the following formula: $Q^{\prime} = {\min\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}$ where Q′ indicates the number of modulation symbols, O indicates a total number of information bits of all UCI corresponding to the downlink component carrier set and is equal to or larger than 2, M indicates the number of carriers included in the downlink component carrier set, N_(layer) indicates a total number of layers corresponding to code words to which the UCI is mapped, M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of a physical uplink shared channel (PUSCH) during initial transmission of the same transmission block, M_(sc) ^(PUSCH) indicates the transmission bandwidth of the PUSCH corresponding to a current subframe, N_(symb) ^(PUSCH-initial) indicates a number of Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols occupied by the same transmission block during initial transmission, and β_(offset) ^(PUSCH) indicates an offset of the UCI relative to a data Modulation and Coding Scheme (MSC).
 6. The UE according to claim 5, wherein the attribute of each downlink component carrier is a carrier index or a carrier frequency.
 7. A base station, comprising: a receiver and a processor, wherein the receiver is configured to obtain channel coded and modulated uplink control information (UCI) from a user equipment device (UE), wherein a downlink component carrier set is configured for the UE, at least one downlink component carrier of the downlink component carrier set belongs to a downlink activated carrier set of the UE; wherein the processor is configured to: determine a quantity of modulation symbols for the UCI according to the downlink component carrier set; demodulate and channel decode the modulated and channel coded UCI according to the quantity of modulation symbols for the UCI; and obtain UCI of each downlink component carrier of the downlink component carrier set according to an attribute of each downlink component carrier; wherein the quantity of the modulation symbols for the UCI is determined according to the following formula: $Q^{\prime} = {\min\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}$ where Q′ indicates the number of modulation symbols, O indicates a total number of information bits of all UCI corresponding to the downlink component carrier set and is equal to or larger than 2, M indicates the number of carriers included in the downlink component carrier set, N_(layer) indicates a total number of layers corresponding to code words to which the UCI is mapped, M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of a physical uplink shared channel (PUSCH) during initial transmission of the same transmission block, M_(sc) ^(PUSCH) indicates the transmission bandwidth of the PUSCH corresponding to a current subframe, N_(symb) ^(PUSCH-initial) indicates a number of Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols occupied by the same transmission block during initial transmission, and β_(offset) ^(PUSCH) indicates an offset of the UCI relative to a data Modulation and Coding Scheme (MSC).
 8. The base station according to claim 7, wherein the attribute of each downlink component carrier is a carrier index or a carrier frequency.
 9. A non-transitory computer readable medium storing program codes for use by a user equipment device (UE) for transmitting uplink control information (UCI), wherein the program codes comprise instructions for: sorting uplink control information (UCI) of multiple downlink component carriers in a downlink component carrier set configured for the UE according to an attribute of each downlink component carrier, wherein at least one downlink component carrier of the downlink component carrier set belongs to a downlink activated carrier set of the UE; determining a quantity of modulation symbols for the UCI according to the downlink component carrier set; determining a quantity of bits for channel coding the UCI according to the quantity of modulation symbols determined for the UCI; channel coding the sorted UCI according to the quantity of bits for channel coding the UCI; modulating the channel coded UCI; and transmitting the modulated and channel coded UCI to one or more base stations in communication with the UE; wherein the quantity of the modulation symbols for the UCI is determined according to the following formula: $Q^{\prime} = {\min\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}$ where Q′ indicates the number of modulation symbols, O indicates a total number of information bits of all UCI corresponding to the downlink component carrier set and is equal to or larger than 2, M indicates the number of carriers included in the downlink component carrier set, N_(layer) indicates a total number of layers corresponding to code words to which the UCI is mapped, M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of a physical uplink shared channel (PUSCH) during initial transmission of the same transmission block, M_(sc) ^(PUSCH) indicates the transmission bandwidth of the PUSCH corresponding to a current subframe, N_(symb) ^(PUSCH-initial) indicates a number of Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols occupied by the same transmission block during initial transmission, and β_(offset) ^(PUSCH) indicates an offset of the UCI relative to a data Modulation and Coding Scheme (MSC).
 10. A non-transitory computer readable medium storing program codes for use by a base station for obtaining uplink control information (UCI), wherein the program codes comprise instructions for: obtaining channel coded and modulated uplink control information (UCI) from a user equipment device (UE), wherein a downlink component carrier set is configured for the UE, at least one downlink component carrier of the downlink component carrier set belongs to a downlink activated carrier set of the UE; determining a quantity of modulation symbols for the UCI according to a downlink component carrier set; demodulating and channel decoding the modulated and channel coded UCI according to the quantity of modulation symbols for the UCI; and obtaining UCI of each downlink component carrier of the downlink component carrier set according to an attribute of each downlink component carrier; wherein the quantity of the modulation symbols for the UCI is determined according to the following formula: $Q^{\prime} = {\min\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot N_{layer} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}$ where Q′ indicates the number of modulation symbols, O indicates a total number of information bits of all UCI corresponding to the downlink component carrier set and is equal to or larger than 2, M indicates the number of carriers included in the downlink component carrier set, N_(layer) indicates a total number of layers corresponding to code words to which the UCI is mapped, M_(sc) ^(PUSCH-initial) indicates the transmission bandwidth of a physical uplink shared channel (PUSCH) during initial transmission of the same transmission block, M_(sc) ^(PUSCH) indicates the transmission bandwidth of the PUSCH corresponding to a current subframe, N_(symb) ^(PUSCH-initial) indicates a number of Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols occupied by the same transmission block during initial transmission, and β_(offset) ^(PUSCH) indicates an offset of the UCI relative to a data Modulation and Coding Scheme (MSC).
 11. The method according to claim 1, wherein sorting UCI of multiple downlink component carriers in a downlink component carrier set configured for the UE according to an attribute of each downlink component carrier comprises: sorting the UCI of the multiple downlink component carriers in the downlink component carrier set configured for the UE according to an increasing order of the attribute of each downlink component carrier.
 12. The method according to claim 3, wherein obtaining UCI of each downlink component carrier of the downlink component carrier set according to an attribute of each downlink component carrier comprises: obtaining UCI of each downlink component carrier of the downlink component carrier set according to an increasing order of the attribute of each downlink component carrier.
 13. The UE according to claim 5, wherein in sorting the UCI, the processor is configured to: sort the UCI of the multiple downlink component carriers in the downlink component carrier set configured for the UE according to an increasing order of the attribute of each downlink component carrier.
 14. The base station according to claim 7, wherein in obtaining UCI of each downlink component carrier, the processor is configured to: obtain UCI of each downlink component carrier of the downlink component carrier set according to an increasing order of the attribute of each downlink component carrier.
 15. The non-transitory computer readable medium according to claim 9, wherein sorting the UCI of the multiple downlink component carriers in a downlink component carrier set configured for the UE according to attribute of each downlink component carrier comprises: sorting the UCI of the multiple downlink component carriers in the downlink component carrier set configured for the UE according to an increasing order of the attribute of each downlink component carrier.
 16. The non-transitory computer readable medium according to claim 10, wherein obtaining UCI of each downlink component carrier of the downlink component carrier set according to an attribute of each downlink component carrier comprises: obtaining UCI of each downlink component carrier of the downlink component carrier set according to an increasing order of the attribute of each downlink component carrier. 